Imaging lens

Active Publication Date: 2014-10-23
TOKYO VISIONARY OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a low-cost and compact imaging lens with a wide field of view (maximum field of view: about 90 degrees) that corrects various aberrations. It is made up of five constituent lenses.

Problems solved by technology

However, if the photographic field of view is particularly widened, a problem may arise that correction of aberrations on the peripheral portion is very difficult and high optical performance is not ensured.
Therefore, it is difficult to realize an imaging lens which meets the needs for high resolution, compactness, and low-profileness and also the demand for a wider field of view.
However, its total track length is about 18 mm, so it cannot meet the needs for compactness and low-profileness.
Furthermore, since all the lens surfaces are spherical, it is difficult to correct aberrations and achieve high imaging performance.
In fact, the disclosed aberration diagrams indicate that spherical aberrations are serious.
Furthermore, since all the lenses are made of glass material, it is difficult to reduce cost.
Also, the maximum field of view is in the range from about 70 degrees to 75 degrees, so it provides a relatively wide field of view but it cannot meet the recent demand for a wider field of view.
In addition, its F-value is about 2.8, so it cannot be said to provide sufficient brightness to cope with a compact, high-pixel image sensor.
Since it is composed of five constituent lenses, it is advantageous in correcting various aberrations but disadvantageous in terms of compactness and low-profileness.
Therefore, the imaging lens described in Patent Document 3 also does not meet all the above recent needs.
As mentioned above, in the related art, it is difficult to provide the required high resolution, compactness and low-profileness and also meet the demand for a wide field of view.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087]The basic lens data of Example 1 is shown below in Table 1.

TABLE 1Example 1in mmf = 2.86Fno = 2.42ω(°) = 44.7ih = 2.85Surface DataCurvatureSurfaceRefractiveAbbeSurface No. iRadius rDistance dIndex NdNumber vd(Object Surface)InfinityInfinity 1 (Stop)Infinity0.030 2*5.3760.7431.54455.57 3*−1.2640.026 4*8.2200.2801.63523.91 5*1.7010.573 6*−1.5470.6611.54455.57 7*−0.8300.025 8*6.3150.3191.53556.16 9*106.9640.06610*45.5400.4121.53556.1611*1.1200.30012Infinity0.2101.51764.2013Infinity0.637Image PlaneInfinityConstituent Lens DataLensStart SurfaceFocal Length121.95924−3.431362.4854812.539510−2.154Aspheric Surface Data2nd Surface3rd Surface4th Surface5th Surface6th Surfacek0.000E+00−1.067E+010.000E+00−9.535E+003.921E−01A4−5.481E−02−5.007E−01−1.097E−012.929E−036.196E−02A6−6.553E−017.506E−01−5.797E−024.613E−02−8.947E−02A81.673E+00−1.373E+003.750E−01−1.081E−014.402E−01A10−2.072E+001.824E+00−2.876E−011.273E−01−1.945E−01A120.000E+00−1.175E+004.022E−02−5.342E−02−2.097E−01A140.000E+000.000E+0...

example 2

[0091]The basic lens data of Example 2 is shown below in Table 2.

TABLE 2Example 2in mmf = 2.86Fno = 2.42ω(°) = 44.7ih = 2.85Surface DataCurvatureSurfaceRefractiveAbbeSurface No. iRadius rDistance dIndex NdNumber vd(Object Surface)InfinityInfinity 1 (Stop)Infinity0.021 2*5.4170.7421.54455.57 3*−1.2690.025 4*7.5990.2801.63523.91 5*1.6610.558 6*−1.4840.6441.54455.57 7*−0.8650.025 8*3.2610.3151.53556.16 9*4.2540.06210*7.2790.4101.53556.1611*1.20870.30012Infinity0.2101.51764.2013Infinity0.683Image PlaneInfinityConstituent Lens DataLensStart SurfaceFocal Length121.96824−3.406362.7894823.544510−2.776Aspheric Surface Data2nd Surface3rd Surface4th Surface5th Surface6th Surfacek0.000E+00−1.090E+010.000E+00−9.511E+002.626E−01A4−6.441E−02−4.927E−01−1.100E−013.777E−031.060E−01A6−6.054E−017.384E−01−5.458E−025.149E−02−1.048E−01A81.635E+00−1.369E+003.684E−01−1.095E−014.312E−01A10−2.117E+001.826E+00−2.901E−011.176E−01−1.929E−01A120.000E+00−1.176E+004.037E−02−4.986E−02−2.099E−01A140.000E+000.000E+000...

example 3

[0095]The basic lens data of Example 3 is shown below in Table 3.

TABLE 3Example 3in mmf = 2.86Fno = 2.42ω(°) = 44.8ih = 2.85Surface DataCurvatureSurfaceRefractiveAbbeSurface No. iRadius rDistance dIndex NdNumber vd(Object Surface)InfinityInfinity 1 (Stop)Infinity0.020 2*5.3990.7441.54455.57 3*−1.2670.025 4*7.9530.2801.63523.91 5*1.6830.558 6*−1.4580.6321.54455.57 7*−0.8820.025 8*3.0540.3411.53556.16 9*3.7750.06910*6.9190.4101.53556.1611*1.2580.33712Infinity0.2101.51764.2013Infinity0.624Image PlaneInfinityConstituent Lens DataLensStart SurfaceFocal Length121.96524−3.418362.9644825.671510−2.951Aspheric Surface Data2nd Surface3rd Surface4th Surface5th Surface6th Surfacek0.000E+00−1.070E+010.000E+00−9.522E+002.510E−01A4−6.215E−02−4.916E−01−1.099E−011.952E−031.112E−01A6−6.172E−017.376E−01−5.274E−025.299E−02−1.049E−01A81.641E+00−1.370E+003.689E−01−1.080E−014.323E−01A10−2.092E+001.833E+00−2.903E−011.174E−01−1.902E−01A120.000E+00−1.176E+004.039E−02−5.078E−02−2.099E−01A140.000E+000.000E+000....

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Abstract

A low-cost, compact and low-profile imaging lens with relatively high brightness, which provides a wide field of view (full field of view: about 90 degrees) and corrects aberrations properly. Designed for a solid-state image sensor, it includes elements arranged in the following order from an object side to an image side: an aperture stop, a first positive (refractive power) lens, a second negative lens having a concave image-side surface, a third positive lens having a convex image-side surface, a fourth lens as a meniscus double-sided aspheric lens having a convex object-side surface near an optical axis, a fifth negative lens as a double-sided aspheric lens having a concave image-side surface near the optical axis, and a conditional expression (1) below is satisfied:|r1|>|r2|  (1)wherer1: curvature radius of the object-side surface of the first lensr2: curvature radius of the image-side surface of the first lens.

Description

[0001]The present application is based on and claims priority of Japanese patent application No. 2013-089041 filed on Apr. 22, 2013, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to imaging lenses which form an image of an object on a solid-state image sensor such as a CCD sensor or a C-MOS sensor used in a compact image pickup device and more particularly to imaging lenses which are built in image pickup devices mounted in increasingly compact and low-profile mobile terminals such as smart phones, mobile phones and PDAs (Personal Digital Assistants), and game consoles and information terminals such as PCs.[0004]2. Description of the Related Art[0005]In recent years, there has been a tendency that image pickup devices mounted in mobile terminals such as smart phones provide high resolution to cope with an increase in the number of pixels. Also, the imaging lenses built i...

Claims

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Application Information

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IPC IPC(8): G02B13/00
CPCG02B13/0045G02B13/06
Inventor HASHIMOTO, MASAYA
Owner TOKYO VISIONARY OPTICS CO LTD
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